346 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 
body whorl; throat, pillar, and body smooth without liration. Type, P. rubida 
Dall. 
Clanculus (Panocochlea) rubidus Da tt, n. sp. 
Plate 8, figures 3, 4. 
The two specimens described below are believed to be young and adult of the 
same species, though in one case the color of the external shell is rose-pink and in 
the other brick-red or dull vermilion. Unfortunately the condition of the frag- 
mentary adult is so extremely fragile, owing to decay, that it could not be en- 
trusted to an artist for illustration, and the characters of the aperture in the adult 
are not shown in the figures of the young. Neither specimen contained the oper- 
culum or soft parts, but there is little doubt that the two specimens are conspe- 
cific. The shell appears to occupy in the system a place half-way between the 
Oriental Clanculus and the South American Monodonta, but rather nearer to the 
former. 
Young shell small, pearly, with an opaque outer coat, and about four and a 
half whorls; above rose-pink, whitish at the apex, base cream-colored; form 
depressed turbinate; nucleus smooth, very minute, globular, followed by one and 
a half similar turns ; the succeeding whorl rounded, gradually becoming flattish 
above, with a single, small, simple peripheral keel, the sculpture then gradually 
taking on the adult characters and the pinkish color; suture narrow, applied mid- 
way between the peripheral and next posterior keel, deeply channelled, with its 
anterior margin beaded; spiral sculpture on the last whorl of four, prominent, 
more or less distinctly beaded keels, one close to the beaded sutural margin, 
the next separated by a much wider space, the next two nearer, equidistant, the 
first. peripheral, and the second at the margin of the evenly rounded base; the 
keels are more or less articulated by crimson dots ; the whole surface is also finely 
spirally striated; axial sculpture only of incremental lines somewhat intensified 
at intervals ; aperture rounded, very oblique, outer lip thin, sharp, a little crenu- 
lated by the keels; body with a wash of callus; pillar arcuate, short, very thick, 
with a prominent basal tooth, the axis imperforate. Height of shell, 4; of aper- 
ture, 2.5; max. diam. 6 mm. 
U. 8.58. “Albatross,” station 3555, Gulf of Panama, in 182 fathoms, mud, 
bottom temperature 54°.1 F. U.S. N. Mus. 122,953. 
Adult fragment. Specimen broken, but showing the characters sufficiently for 
description ; general form depressed-turbinate, with four and a half whorls; color 
brick-red, paler on the prominences; suture closely appressed to a peripheral 
keel, which on the spire is smooth, on the last whorl undulate; the sutural mar- 
gin of the last whorl is marked by a very strong, low, coarsely beaded spiral rib, 
jn front of which the whorl is very flatly arched to the periphery ; on this surface 
are six or seven rather strong beaded threads similar to that forming the periphery, 
their intervals appear irregular and contain many extremely fine, obscure, spiral 
threads; base forming an imperforate flattened dome, with one spiral thread near 
